Safety device



Oct. 20, 1931. VQN HENKE 1,828,723

SAFETY DEVICE Filed March 8. 1927 Y EDMUND ;r.;vo1w-HEn E, or CHICAGO} inrInoIs-,Assmnon ro ilnirbMArIcsArErY TRIP:

Patented" Oct. .1931

conronnrron, or CHICAGO,=ILLI1\TOIS, -A conrone'r oivor rnnnvors I Appl icatinn' March 8, My inventionrelates" to safety devicesand I particularly to such devices-for use inm'apresses? and the like.

chines; snch as punch I Many 'efiorts have been made heretofore-"to produce a device which would guarantee the I p p 1 pnnchj member, if the tripping; stop 9 Y is removed from engagement with the lever 6' and removal of the operators fingers 'from the danger zone whlle the press is operatmg, but

such devices for one reasonor another do not The device which: I: have described andjwhichvvill behereinafterclaimed overcomes the objections of: the devices heretofore "in rise and at the same-time is a simple and inexpensive device" and one,

' not likely to get out of order;

. upon d,; and a clutch imechanlsm for connect ng the fiy-wheel to the shaft,iuponwhichit nor- #My invention will be better understood reading the renewing description taken inf conne'ction withthe accomp anyingdrawings,

"Fig." 1 is a side view o machine with certain parts in section and" Fig. 2 is a front elevationof a portion of the machine showing my which difie'r from each other in detail, but

reciprocating the punch member. I have shownWp'ortio'n' of; the frame 1, a shaft 2 which a'pulley or fly-wheel '3 is mount:-

mally rotates freely, for the purpose ofvreciprocating the ram: at desired timesg This clutch memb'er may be of vany 'con'str-l lctionf,

but I have illustrated one well-known form now in' general use which consists ofja rotatable'key shaft 2 and adapted when rotated; to "connect the hub of thefly-wheel 3to the 'shaft'f2;

Normally the key 4ris-heldin the' position shown in Fig.1 against th action of the coil spring 5, by the tripping stop 9. Qnejen'd is connected with the 'key 4, and; the other end bears against a stop? on a collar 8 fas tenedon'the shaft '2. The lever 6'is held in:

fixed 'oil' a "1 0d? 12- "andithe other end bearing -,punch member remains stationary. I

f a portionof:

",througha switch'20, push button 14-, push device attached theretoi There are many; forms of punch-presses position Fig, 1-. V tates a member 24; around the pivot and "et' mounte'd in aisuitable slot inthe n shown 1n Fig. l-by 'a t rippin'gi This; in turn cau sesfa w of the tripping stop 9fthroi1gh the rod parts iarein the position'shown in 'Fig' 1 the fi i heel rotates freely on the "shaftand the "fWhen it is desired 'to operate the ramfor.

the 'spri11g{ 5-acts through the lever 6 to rotate T thekey f l sofa's to con'nec't'the pulley with operation is produced as follows:

Two push ontto'ns ll' and 1-5 are connected in seriesiinthexcircuit of; an electromagnet 16l1av1ng an armatnrell'i' which is connected witha link 18.}- The circuit of the magnet 16 extendsfrom one side19 of the supply line, c

button 5;, m gnet :16, contacts 21, wires 22 to' the' other side 23 ofjtheliney 7 Vl hen the magnet 16 is energized the 18 is \moved upwardly from the dottedline to thefnll line position shown "in o, This movement'of the 1ink'18 rosets the toggle 26-27, the member 24' being connected to-themembers 2627 at their ,point of connection to each other, rotating a member 28; in an anti-clockwise direction around the pivot 29 becanse of the connection. r

of the end of 27 with'2 8. The setting of the toggle 265-27 effect rigidly connects the m'ember'QS with the operating member 30 Y which is pivo'tedtotheframe of the machine it'll-31 whichpivotis concentric with thepivf otal connection between the link 18 and mem-' ber The fly wheelais provided with a pin or othersuitable projection 82,- Upon thglnpward movement of "therlink 18"t'he me'mber 28 is moved upwardly to the position showniin full lines into the path 'of thepin 32 whichupon the revolution ofthe fly-wheel the pivotal point 31in a clockwise direction;

downward movement I eng'agesthe member 28: and rotatesthe' same 'around'the pivotal'point31. This rotation 'loitively forces thei'arm 30 torotate around I J' t which is connected with the stop ,9, As soon as the pin32 operates the arm 30 it is evident that the tripping stop 9 is removed from the lever 6, whereupon the clutch is engaged and the punch member or ram of the press is operated. Immediately upon the. actuation of the tripping stop f) the member fi wi'llnnove away from engagement therewith, but the v spring will cause the stop9 to immediately moi e; backinto the path" of the lever- 6= and as soon as the shaft 2 ha s completed' a single" revolution the lever 6 will then engage the stop 9 and disengage the clutch whereupon the ram will come to a standstill .Upon the. downward movement of the rod 33'the meinber 34; which isconnectedtherewith will rotate the bell crank lever 35 in a clockwise di -g rection and open the contacts-2L;- This bell crank will remain in the: operated position because of the spring link-connection 36. Thisoperation opens; the contacts 21 which are in series with the magnet 16 therebyde energizing the magnet which, in turn, .per-

mite-the link l8 to dropand break the tog-- gle 26 27, whereupon the member'28- immediately moves to the dotted lineposition out of the path of the pin 32. The clutch will therefore remain. disengaged and the press will not repeat. It will not be possible to again operate theram of the press until the buttons la and have been released and have, moved back-into engagement with .the

back contacts 37, This engagement of the push buttons of-the'back contacts establishes; a circuit' througha'magnet 38wl1ich closes the ,contactsQl and at the same times moves the bell crank 'to. thepositionshown in Fig, 1. In Ordertoagain operate the ram of the presswit becomesrnecessary' for the.operator to-place his. handson the push buttons;

I l-and l5,respectively, since thesetwo buttons are placed apart a distance sufficient to make itjimpossible to be. operated with one buttons until-the ram has operated,r.otherwisethe circuit of the. magnet; ,16; will be interrupted: whereupon the. clutch'would notbe tripped. VAfter thepress isgoperated the circuit of the magnet is automatically opened by the opening ofthe contacts21 andthereafter the presswill not repeat even though the'operator continues to l1old his hands on the: push buttons. Thev push buttons must .be

released inorder: to eifects the closing;of-the contacts 2i and must be pressed again before the press can again operate. r

Electromagnetic. means have been suge gestedrfor use in. this connection heretofore,

but in "such casesthemagnet must-beextremei 1y; heavys'in order to zprovideia'suificient amount of power to trip the press, the magnet in those cases havlng been arranged to act directly to trip the clutch. A magnet having a sufiicient amount of power is inevitably sluggish in operation and in practice it oftenhappensthat this sluggishness pre-' vents the resettin of: the." press quickly enough to prevent the repeating of the operation by the ram. Such a repeat operation hasf-i'eo1uentlfyresulted in serious damageto the hands orfin'gers of the operator because at that time the operator would be either removing'the results of the preceding operation or p lacing..materi al into position to be acted upon by the press. b

[By utilizing the electromagnet means; to operate the light togglemembers only and incombinat ion therewithntilizingthe power:

Ofithefly-wheeltoperform thetripp ing open atiomcthemagnet 16 is very quick and ithe. entireoperation. is therefore sensitive and dependable; The: electromagnetic member of thesmechanism;performs.very little work and: therefore .be designedito operate l quickly and; dependably for the purpose f l i or. rendering. effective an everpr-esent power of sufficientmagnitude to'operate the tripping ,mechanism. without anyr uncertainty whatever. 7

In-present: devices lazy-operators willat times.v wedgev one of the buttons leaving it continuously in the on position so asto save effort of pressing both buttons eachg time, leavin-gone of. his hands free ands-ubject to. accident, Nosuclnaction is possible in my device as both buttons must' be. returned:' to. back contacts 37 before magnet. 16 canbe: madeto perform. another operation.

Ii have" therefore devised means which secure. maximum safetyagainst. damage to thev operator and whichat the same time arein expensive. and simpleand. easily, operated and: maintained in operating. order. The many advantages. resulting; from my inventionr Willi be apparent to.;those skilledr in the art. I b

I'claiimi b I p p I 1; In.an automatiepress, the combination of: adriving. shaft, ally-wheel, aram. operated from saidshafh a clutch through which: said ram may; beconnected to sa-id shaft, "mechanicalrmea'ns whose operation to operative posi tiondependsrupon the-absence of both. hands of theoperator. fromv the danger zone'of: said ram. for inter-posing: a. clutch, actuator. the

said shaft and saidlram and meansfo-rengag .ing: said" clutch comprising. v a lever, a projecs tiojn {OIljSfi-ld flywheel, meansfor said lever; into, the path of said pro] ect1on and means emulated{through-x the; engagement of resses havin a fi -wheel com risin an said projection with said lever to engage said clutch.

3; In a press, the combination of adriving shaft, a fly-wheel, a ram, a clutch between said shaft and said ratnand means for engaging said clutch comprising a lever, a projection on said fly-wheel, requiring both hands of the operator for moving said-lever into the path of said projection and means'actw ated through the engagement of said projec tion with said lever to engage said clutch.

4. Means for trip ing the clutch of punch presses having a y-Wheel, comprising an actuator on the .fly-wheel, a pivoted lever, an

electromagnetic relay for moving said lever into the path ofsaid actuator, means requir ing both hands'of the operator for energizing said relay and means controlled by said lever for tripping the clutch.

5. Means for trlpping the clutch of punch actuator on the fiy-Wheel, a pivotedlever, an electromagnetic relay for moving the lever into the path of said actuator, means requiring bothhands of the operator for energizing said relay, means controlled by said lever for tripping the clutch, and meansrendered effective upon the tripping of said clutch for I ca-l means for 10. In a clutch tripping mechanism for punch presses,

j and comprising an electromag'-- ping means net, two push buttons in serles 1n the c1rcu1t the combination of mechani-' tripping the clutch. and 8190-1" 'tromagnetic meansfor controlling said tlflp-f a '70 of said magnet and sufliciently separated to require both hands of the operator to close the magnetcircuit, contacts also in said mag j ping of said clutch foropeningsaid contacts net circuit, means operative upon the-trip,-

and a magnetic relay forrclosing said con- 7 tacts'upon the release of said-push buttons.

. 11; The combination of a rotatable Wheel, 7

means operablyconnectable with said wheel, a relay device actuated directly bysaid wheel wheel andsaid meansand' means under the control of an operator for controlling said relay.'

clutch, mechanical means actuated by the wheel for controlling the clutch, and a relay device under'the control ,of an operator for controlling said last-mentioned means.

13. In an automatic press,the combination of a driving shaft, a'fiy-Wheel on said shaft, a ram driven from said shaft, a clutch be tween said shaft and ram, mechanical means operable directly by said fly-wheelfor-actw ating said clutch, and a relay for controlling ,said clutch-operating means. 1

EDMUND." J, YVONI- HENKE.

.7. Means for tripping the clutch ofpunch I,

v presses having a fly-wheel, comprising an actuator on the fly-wheel, a toggle controlled pivoted lever, a relay for setting the toggle Q to bring the lever in the path of the actuator,

means controlled by the lever for tripping the clutch, and means actuated upon the tripping of the clutch for preventing the press from repeating.- c

8. In a clutch tripping device for punch presses, the combination of a bell crank lever" having one arm pivotally mounted, a toggle for rendering said arm rigid with respect to the other partof the bell crank, clutchftripping means actuated by onearm of said'bell crank and means under the control of the operator for setting said toggle. i

' 9. In a clutch tripping devlce 7 presses, the combination of a" bell crank lever having one arm pivotally mounted, a' vtoggle for rendering said arm rigid with respect tothe other part. of the bell crank,

' clutch trippingmeansactuated by one arm of said bell crank, meansunder the control ofthe operator for setting said toggle, and means. on a constantly moving part of the press forrotatingythe ll crank to trip th i clutch. I M

for punch 1 12. The combination of a rotatable wheel, means op'eratively connectable therewith, .a

for controlling the connection between said I CERTIFICATE OF CORRECTION.

Patent No. 1,828,723. Granted October 20, 1931, to

EDMUND J. von HENKE.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 3,- line 88, claim 12, after the word "actuated" insert the word directly; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 2nd day of February, A. D. 1932.

M. J. Moore,

(Seal) Acting Commissioner of Patents. 

